RTU smokie

[smilies]

Reefer guy here but saw this and it interested me. The first 2 pics are one unit and the second 2 pics are another unit. That PVC goes to a smoke detector inside the blower compartments and, as you can see, the pipe terminates at the drains. There is an additional smoke detector in the blower areas that are tubed the way I'm used to seeing them. What is being accomplished here??

[dandyme]

never seen that done before

no clue what they thought they were accomplishing

[ascj]

Waterless condensate trap?

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[echocrewchief]

In the first two pictures, the lines connected on the back side of the unit aren't even serving as a drain.

I've got no ideas except for the installer had extra PVC and didn't know what to do with it - or it's a means to equalize the pressure in the condensate line to eliminate a trap.

[Dchappa21]

Looks like a plumber installed it.

[carmon]

I have never sen such a thing.....

[smilies]

Dern, was hoping this was some kind of new thing, or some plausible explanation.

[ascj]

Waterless traps.....
http://www.trenttech.com/product_overview.html

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[maxster]

on a 100F day and a bird lands on top of the PVC riser pipes...snap the manufacturers spend millions of dollars keeping units weather tight. if any PVC is on the negative side of that supply fan they are going to suck rain water into the ducts... the typical trap is right below the fan access panel or coming out from the below that OA hood..that is a power exhaust for sure...maybe that's the piping show needed

[echocrewchief]

Nice find ascj

[Kerplacknia]

that is crazy i have never seen anything like that and honestly never saw or heard of that before

[hvac wiz 79]

I see it now & again. I never knew why they were set up this way

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[smilies]

Thanks, ascj